Project Info

D/2 Biological Solution

Cleaning off the mold and mildew of the stagnant fall and winter can be difficult, but D/2 Biological Solution gets the job done safer and with less elbow grease.

D/2 Biological Solution works on many surfaces including masonry, stone, concrete, wood, asphalt shingles, vinyl and aluminum siding, fiberglass, metal, paint, and canvas to remove stains from mold, mildew, algae, lichens and air pollutants.

D/2 Biological Solution is a safer, easy to use liquid that doesn’t require any scrubbing or rinsing.

No Scrub/ No Rinse Method: Using a sprayer (pump-up, low pressure, or other), wet the entire surface of whatever you’re cleaning with D/2 and allow it to air dry. D/2 works with the elements and results occur within one week to one month, depending on the severity of the biological growth. Reapply D/2 if rain occurs within 12 hours of application. This method will take longer than the scrubbing method, but within a month you should see significant results which will continue to improve and keep the applied area clean. Reapplication is recommended every year or two.

The immediate results method requires a bit more elbow grease but really is quite simple. Apply D/2 with a brush, roller, or sprayer, and allow it to remain on the surface for 5 to 10 minutes. Apply additional D/2 to maintain a wet surface during the above stated time period. Scrub the surface thoroughly with a non-metallic, short fibered scrub brush, lightly mist with water and continue scrubbing. Once the scrubbing is done, thoroughly rinse the area with clean, potable, water using a hose or sprayer. Click here for more information from D/2 Biological Solutions Website.

Best if used when temperatures are above 45 degrees. Reapply, if rain occurs within 12 hours of cleaning. You can order D/2 by going to or call 215-536-6706.

Before and After Pictures in Frederick
Click images below to make larger.
D/2 Sold in 1 gallon, 5 gallons and 55 gallons
Before applying D/2
After applying D/2

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